Nanako, a teacher at a girls' school, had relationships with students in the class she was assigned to every year. This year, she sets her sights on Reina in the class she's teaching. Reina, while bewildered by Nanako's invitation, gets hooked on their forbidden relationship. One day, in the guidance room, Reina is repeatedly cummed on by her homeroom teacher, Nanako. "You're a naughty girl, aren't you? I'll keep these panties for you." The teacher's lesbian training…